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If a Hades, Sorcerer of Eld you control is destroyed by a spell you own, Hades will be exiled and then the spell will be put into your graveyard
At four mana, he isnt that hard to cast either
This is downright nasty in decks with newly unblockable Commanders led by Rogue's Passage and Sun Quan or with unblockable or evasion themselves (Dromar, the Banisher
Maybe if Deep Water turned all your lands into Islands, it would matter for cards like Engulf the Shore, Scourge of Fleets, or Vedalken Shackles
The biggest benefit to this is that Mewtwo ex is very quick and easy to set up due to being a basic Pokemon, and can even be sought out through the addition of cards such as Poke Ball